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PTB78520WAH
20-A, 18-60-V Input Auto-Track Compatible Isolated DC/DC Converter
20-A, 18–60-V Input Auto-Track
Compatible Isolated DC/DC ConverterTypical Application
Features Wide-Input Voltage Range:
18 V to 60 V 20 A T otal Output Current 90% Efficiency Wide-Adjust Output Voltage:
1.8 V to 3.6 V Over-Current Protection Output Over-Voltage Protection Over-T emperature Shutdown Output Enable Control
Description
The PTB78520W is a 20-A rated,
wide-input (18-60 V) isolated DC/DC
converter that incorporates Auto-Track™
power-up sequencing. This allows these
modules to simultaneously power up with
any other downstream non-isolated, Auto-
Track compliant module.
The PTB78520W module provides
two outputs, each regulated to the same
voltage. During power up, the voltage at
‘VO Bus’ rises first, allowing this output
to provide input power to any downstream
non-isolated module. The voltage from
‘VO Seq’ is then allowed to rise simulta-
neously, under the control of Auto-Track,
along with the outputs from the down-
stream modules.
Whether used to facilitate power-up
sequencing, or operated as a stand-alone
module, the PTB78520W includes many
features expected of high-performance
DC/DC converter modules. The combi-
Pin-Out Information
Pin Function Track
5VO Com (–) Sense Vo Adjust (+) Sense
9VO Bus VO Seq
Shaded functions indicate signals
electrically common with the input.
* Denotes negative logic:
Low (–VIN) = Normal operation
Open = Output off Auto-Track Compatible
Sequenced Output Smart-Sense Remote Sensing Under-voltage Lockout Industry Standard Footprint Surface Mountable 1500 VDC Isolation Agency Approvals (Pending):
UL/cUL 60950, EN 60950
nation of input-output isolation and a
wide-input voltage range, allows operation
from either +24 V or –48 V. The wide-
output adjust enables the output voltage
to be set to to any voltage over the range,
1.8 V to 3.6 V, using a single external
resistor. Precise output voltage regula-
tion is assured using Smart-Sense. This
is a differential remote sense that will
intelligently regulate the sequenced out-
put, depending on its sequence status.
Other operational features include an
input under-voltage lockout (UVLO) and
an output enable control. Over-current,
over-voltage, and over-temperature pro-
tection assures the module’s ability to
survive any load fault. ypical applications include distributed
power architectures in both telecom and
computing environments, particularly
complex digital systems requiring power-
sequencing of multiple power supply rails.
SLTS226A – JULY 2004 – REVISED OCTOBER 2005
Not Recommended for New Designs
